The Art of projection and complete magic lantern ... - Yesterday Image

109Fig. 57- Fig. 58.READING LAMP.A Lamp that will give a fair amount of light, and not go out in themiddle of an effective description !Candle lamps, after burning some time, become heated, and melt thecandle, which topples over, and the lecturer is hors-de-comhat.Oil lamps, where colza or sperm oil are used, are very messy and dirty,and thread-like cottons must be used, and with these a pinion cannot befitted, the consequence is that the wick, which is perfectly firm whenstarting (the oil being cold), but after it has become heated, it has apeculiar knack of slipping down, and when attempting to prick it up, actsin a similar manner. The only remedy against these embarrassingobjections, is to have a lamp with a woven wick, and a rack and pinionto raise and lower it at will, burning benzoline or paraffin. If a candlelamp is used, the candle itself must not be inside the lamp, but ratherbelow, on the principle of a carriage lamp, the bottom being pressed upwith a spring, so that the candle, or the lighted portion, is always on thesame level.Figures 57 and 58 represent the benzoline reading lamp.is outside the lamp and reduces all fear of being over heated.The cisternIf benzolineis used it is only necessary to saturate the wool in the cistem, and if itis over-filled, or run over, it immediately evaporates without leaving anymess or smell behind. There are two means by which the cue may be